package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.time.LocalDateTime;

@Component
@Slf4j
@Aspect
public class AutoFillAspect {
    @Pointcut("@annotation(com.sky.annotation.AutoFill) && execution(* com.sky.mapper.*.*(..))")
    public void autoFillPointCut(){}


    // 自动填充
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){

        log.info("开始自动填充");

        //获取当前数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
        //获取当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args.length == 0||args == null){

            return;
        }

        Object entity = args[0];
        //准备数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据不同的操作类型,为对应的属性通过反射赋值
        if(operationType == OperationType.INSERT){

            try {
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class)
                        .invoke(entity, now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class)
                        .invoke(entity, currentId);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class)
                        .invoke(entity, now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class)
                        .invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if(operationType == OperationType.UPDATE){
            try {
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class)
                        .invoke(entity, now);
                entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class)
                        .invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
